The present invention relates to an infant container, particularly a
baby bottle, in which a container-shaped body is formed of a flexible material such as
silicone to allow more hygienic maintenance, while airtightness is enhanced by a cap member made of a hard material, and the cap member can be easily attached through a one-touch attachment / detachment mechanism using a fastening protrusion and a catch, and, in particular, the container-shaped body and the cap member engage with each other through a wave-shaped locking surface such that the cap member does not easily loosen and remains locked, thereby ensuring safe use. The infant container comprises: a container-shaped body made of a flexible material including a shoulder portion connected inwardly from an upper portion of an outer surface of a side wall, and a neck portion connected upwardly from an inner end of the shoulder portion and having an upper opening; and a cap member made of a hard material and having a skirt portion fastened to an outer circumferential surface of the neck portion. The container-shaped body includes fastening protrusions that protrude from the outer circumferential surface of the neck portion and have a downward-inclined bottom surface; and
insertion grooves formed between the fastening protrusions. The cap member includes catches that protrudes from an inner circumferential surface of the skirt portion, are fitted into the
insertion grooves, and engage the downward-inclined surfaces. The shoulder portion and the lower end of the skirt portion are connected in a
wave shape along the circumferential direction to form a wave-shaped locking surface that engages and seals tightly.